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Re: Performance Characteristics of All Linux RAIDs (mdadm/bonnie++)

To: Jens Bäckman <jens.backman@xxxxxxxxx>
Subject: Re: Performance Characteristics of All Linux RAIDs (mdadm/bonnie++)
From: Bryan Mesich <bryan.mesich@xxxxxxxx>
Date: Wed, 28 May 2008 11:46:16 -0500
Cc: linux-kernel@xxxxxxxxxxxxxxx, linux-raid@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx
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Reply-to: Bryan Mesich <bryan.mesich@xxxxxxxx>
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On Wed, May 28, 2008 at 06:34:00PM +0200, Jens Bäckman wrote:

> Either the RAID 1 read speed must be wrong, or something is odd in the
> Linux implementation. There's six drives that can be used for reading
> at the same time, as they contain the very same data. 63MB/s
> sequential looks like what you would get from a single drive.

The RAID 1 read speed metrics do not depict multithreaded
processes reading from the array simutaneouly. I would suspect
that the read performance metrics would look better if 2 bonnie
simulations were ran together (for RAID 1 that is).


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